74 RECENT CHANGES IN THE SURFACE OF JUPITER. 
meters at Greenwich, it would not be safe to say that there is no 
common cause for the changes we have been considering; and I 
am sure this suggestion would have come to you with far greater 
force if you could, with me, have watched, between the terrestrial 
clouds, the many changes going on in Jupiter. Much was missed, 
I know, for I saw many things after they were done, in a glimpse 
as it were ; for instance, after a week of clouds here, I saw on 
November 14 that the whole aspect of Jupiter’s northern hemi- 
sphere, from latitude 36° northwards, had changed from a bright 
surface marked by faint belts, to one mass of belts, in which the 
common ones were lost, and a host of strange markings put m 
their place. Answers to the questions—how, and when, and 
why all this took place, were covered up by the clouds that lasted 
here from November 7th to 14th. 
a 
belt of clouds, shining white in the sunlight, probably almost as 
white as the snow caps ; on the equatorial sides he would see the 
clearer regions of the trade winds, at times marked by pe 
restrial air clear at the same time as own, it 
next to impossible to distinguish forest-covered earth from ocean 5 
ponderous cloud bank, black enough to obliterate ev 
beneath it, and perhaps, most conspicuous of all, wo 
brilliant white cloud ring which generally surrounds the agile 
somewhat broken and irregular in outline though it be. i wil 
ing these cloud features, he would see them travel north am ibe 
with the changing declination of the sun, and wonder whether 
few bright points could be the only fixed things on the 
Just so, I think it is, that we see Jupiter. Our wee 38° 
by the belts. We see on the polar sides of laty change; 
almost uninterrupted bright zones, where there is but i rent 
but from these latitudes towards the equator the case 38” 38° to | 
at one time we find white zones covering everything from time} 
18° on each side of the equator, as we see it at the pee 
at another time all this is changed, and their place 1 
ever-changing light-red-coloured rings as in 1876. 
